Now her young lover Casper Smart, 25, is pushing J.Lo to capi­talize on the kids’ camera-ready cuteness, and 44-year-old salsa king Marc “is seething,” the source added.

“When Jennifer let slip that it was Casper’s idea to enroll Emme in dance classes and send her out on auditions for commercials, Marc barked, ‘Over my dead body!’

“He thinks Casper is shilling Max and Emme with the hope of taking a co-management fee.”

But J.Lo isn’t backing down.

“She told Marc that she’s perfect­ly capable of serving as the twins’ manager, and she can prevent any meltdowns on the order of Britney Spears or Lindsay Lohan,” said the source.

“But Marc isn’t having it. He has dreams of his kids becoming rock­et scientists or teachers.”

While The ENQUIRER has re­ported that J.Lo was having second thoughts about their split, “with this latest spat, it looks as though there will be no reconciliation,” said the source. “Marc is going full-speed ahead with the divorce.”